diff options
| author | Kenneth Lo <Kenneth_Lo@asus.com> | 2014-04-10 14:08:16 +0800 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2014-04-30 03:21:51 +0000 |
| commit | 0e1f0e7a355344568e810db1ec0ffd597ad68557 (patch) | |
| tree | cc59f18ff34efb5b3bf9926dac6369ec49388798 | |
| parent | d95fcdc457a51dff8003b8cb29b32319f4fdd8ca (diff) | |
| download | chrome-ec-0e1f0e7a355344568e810db1ec0ffd597ad68557.tar.gz | |
Quawks: Add pure hardware shutdown mechanism.
Quawks boards need a pure hardware protection mechanism to
shutdown/reset system even if EC is hanged. This is done using the
ALERT# pin of TMP432 thermal IC.
So EC programs TMP432 with specified temperature limit value every time
when system is booted, to make sure this mechanism works as expected.
BUG=chrome-os-partner:28184
BRANCH=rambi
TEST=Run "make -j buildall" and "make -j BOARD=quawks tests".
Tested by thermal engineers that system will shutdown when
specified temperature is reached.
Change-Id: I485852409153c036488eac2ae9c0a8fe4e2c5b61
Signed-off-by: Kenneth Lo <Kenneth_Lo@asus.com>
Reviewed-on: https://chromium-review.googlesource.com/195120
Reviewed-by: Randall Spangler <rspangler@chromium.org>
| -rw-r--r-- | board/quawks/build.mk | 2 | ||||
| -rw-r--r-- | board/quawks/thermal_shutdown.c | 47 |
2 files changed, 48 insertions, 1 deletions
diff --git a/board/quawks/build.mk b/board/quawks/build.mk index d3bca1d912..94cb6192a2 100644 --- a/board/quawks/build.mk +++ b/board/quawks/build.mk @@ -9,4 +9,4 @@ # the IC is TI Stellaris LM4 CHIP:=lm4 -board-y=battery.o board.o led.o +board-y=battery.o board.o led.o thermal_shutdown.o diff --git a/board/quawks/thermal_shutdown.c b/board/quawks/thermal_shutdown.c new file mode 100644 index 0000000000..9730363d9e --- /dev/null +++ b/board/quawks/thermal_shutdown.c @@ -0,0 +1,47 @@ +/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +/* + * Pure hardware thermal shutdown via TMP432 for Quawks. + */ + +#include "board.h" +#include "console.h" +#include "hooks.h" +#include "tmp432.h" +#include "i2c.h" + +#define CPRINTF(format, args...) cprintf(CC_THERMAL, format, ## args) + +#define THERMAL_SHUTDOWN_TEMP 76 + +/** + * Set pure hardware thermal shutdown temperature via TMP432. + * + * The target temperature value is set in board.h. + */ +static void set_pure_hardware_thermal_shutdown_temp(void) +{ + int value; + + if ( i2c_write8( + I2C_PORT_THERMAL, + TMP432_I2C_ADDR, + TMP432_LOCAL_THERM_LIMIT, THERMAL_SHUTDOWN_TEMP) >= 0 && + i2c_read8( + I2C_PORT_THERMAL, + TMP432_I2C_ADDR, + TMP432_LOCAL_THERM_LIMIT, &value) >= 0) + { + CPRINTF("[%T TMP432_LOCAL_THERM_LIMIT now = %dC]\n", value); + } + else + { + CPRINTF("[%T Failed to set shutdown temp!!]\n"); + } +} +DECLARE_HOOK( HOOK_CHIPSET_STARTUP, + set_pure_hardware_thermal_shutdown_temp, + HOOK_PRIO_DEFAULT); |